Product Description

*Freight includes shipping BOTH ways and it must be a commercial address with a forklift or extra shipping charges may be applied.

We build a complete transmission that is ready to bolt in and go. All of our Allisons are built the same (clutch pack stackup) whether you're looking for a 1000+RWHP truck or you're looking for a reliable transmission for your 500HP daily driver. Our transmissions have been in multiple trucks well over 1000+RWHP with lots of abuse drag racing, dyno runs and sled pulling all on the same build for a full season. We set them up according to your predicted power level and we can add billet shafts/hub, C3 PTO oiling holes or a pan for the cost of parts. It is preferred to use your current transmission that is in your truck but we do have cores on the shelf which we can build to order.

-Powder coating the cases is $425. If this option is selected, please tell us your color choice in the order comments.

We can have your transmission shipped to us to build, or build one of our cores to your specs and ship it to you. Contact us regarding shipping costs and times. Our fixed rate of $675 is for round trip freight (to you and your core back to us is included) if going to a commercial address with a forklift. If you send your transmission to us on an open pallet, we charge $100 extra for the crate that it will be returned to you with, the transmission must be crated to have insurance on the shipment.

*We recommend that you have us add a Mag-Hytec deep pan or aftermarket transmission cooler if you plan to tow heavy in higher temperature climates.

*The core must come back in rebuild-able condition in order to qualify for the full core refund. This includes but not limited to; planetaries, pump housings, shafts, gears, housings etc. Please allow 4-5 business days for inspection before the core refund begins processing.

Product Reviews

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You found SDP and the right crew, quit shopping around!

Posted by Ted on 8th Apr 2019

I waited to review the rebuild for 1 year to see how the transmission would hold up to over 15,000 miles of heavy hauling, long trips, and a heavy foot. I 100% recommend Scott and his crew to take care of customers with rock solid transmission and Duramax work.
They had my truck in and out of the shop in about 24 hours when I was prepared to leave it for a week. My LBZ and I were taken care of perfectly.
The trans shifts firm and I have no worries about it's function. SDP recommended a few upgrades to the transmission and talked me out of unnecessary expenses that wouldn't benefit me. They also sent me with an extra filter to change after break in and answered all questions I had about my EFI live and heavy towing. I added a 200hp tune and the trans doesn't miss a beat!
I also had SDP upgrade my transfer case pump while the trans was out to save more money and avoid future problems. Do it! These guys are great!

Allison trans

Posted by Dan Harris on 17th Mar 2019

Great tranny,shifts are crisp and customer service is phenomenal. Wouldn't buy any other trans these are top of the line!!

awesome

Posted by ryan on 9th May 2018

Transmission feels very solid while driving. Have over 10k miles on mine and its been flawless. Best thing I have ever done to my duramax.

butter

Posted by Unknown on 26th Nov 2017

Now she shifts like butter. Gives you that slight jerk when the converter engages. Just enough to let you know it’s ready for anything but not violent like some others can be. Won’t let anyone else touch my rig besides SDP. They continue to go above and beyond to make sure their customers are taken care of.

Awesome transmission

Posted by Adam Claussen on 13th Sep 2017

These guys have great customer service , they adjusted their schedule for mine and got me in on a day that they normally would be closed. The truck was in and out of the shop with a new transmission and tunes in just a few hours and I haven't had a single problem with it. The Goerend Torque converter is awesome too! Couldn't be happier with the product and the SDP crew.

Now a lifetime customer!

Posted by Unknown on 4th Sep 2017

Awesome job on the transmission looks great and runs even better. Also a big shout out to Felicia and Scott for the excellent customer service.

SDP transmission, Goerend R converter, best combo.

Posted by Jacob Thomas on 7th Aug 2017

Couldn't ask for a better performing transmission, that's why I bought two of them. I have one in my LML and one in my LBZ. Putting down close to 700rwhp and 1200ft lbs of torque in my LML and it hasn't skipped a beat. Helped me dip into the 12s as well. Extremely happy with the transmissions that scott and John put together.

Awesome trany easy to deal with

Posted by cory j Spaulding on 3rd Jul 2017

transmission looked great and performed great ordering was easy and shipping was fast thanks Guys and gals for all your hard work

GAME CHANGER

Posted by jaket15@live.com on 12th Jun 2017

I had a transmission from suncoast in my LB7... after this purchase I will buy SDP transmissions every time. Everything is so smooth, the TQ converter lockup is almost unnoticeable. Had it installed at SDP, got to watch these guys build 3 transmissions. The way these guys perfect the transmissions before they go out the door is almost an art. 10/10 every time!

GM BUILT TRANSMISSION

Posted by RUSS-POWERFLO DIESEL on 5th Jun 2017

WELL, SCOTT AND HIS GUYS DID IT AGAIN, THIS TRANS IS PERFECT. CLEAN, PERFECT SHIFT POINTS, WE CAN RUN IT ON THE TOP TUNE AND NOT WORRY ABOUT ISSUES. FANTASTIC, ONCE AGAIN. THANKS GUYS...

built trans

Posted by ryan on 4th Jun 2017

Great guys/girls, loving the transmission

Very pleased

Posted by Lonnie Pratt on 20th Apr 2017

Scott and John are great! Very good customer service and my transmission i couldn't ask for it to work any better. Everything I could of asked for thanks again guys and I will definitely be back and refer other to give them a try for any duramax needs

Awsome Upgrade

Posted by Justin Spragg on 10th Apr 2017

This is the second transmission Scott has done for me (two different trucks) and I am very impressed! Not only does the transmission work flawlessly but scotts customer service is out standing! I am very happy with not only the transmission but the experience at SDP. Scott is very knowledgeable and knows these trucks inside and out! Also his mechanic John not only whipped out my build with an impressive turn around time but was very professional and attentive to my truck right up until I left. These guys have my business.. Gauranteed!!

Awesome transmission!

Posted by Nathan McCutchen on 10th Apr 2017

Scott and John are awesome to deal with and stand behind their products. Have probably about 12k miles on my trans and it never misses a beat!

Awesome

Posted by Lewis on 1st Feb 2017

So far I have a little over 500 miles on the transmission, and it is night and day between my old one and this one. You can really feel the TC lockup, which the old one you couldn't even tell. They have some amazing cuter service. Scott has answered my calls and questions, and he worked with me on last minute scheduling changes.

changed my truck completely

Posted by dalton gardner on 10th Jan 2017

Awesome customer service, really helpful and are willing to talk through any questions at all. And this trans build is wicked puts my old BD build to shame.

Very Nice, Well Built Transmission

Posted by Matt Early on 7th Oct 2016

I had this trans installed by SDP at their shop and it shifts very smoothly and doesn't run all the much hotter than stock. 10/10 would recommend

2006 CCSB 500hp

Posted by Jason Drauch on 28th Jul 2016

I did a lot of research before bringing my truck to SDP to build my allison. After talking to Scott and Jake over the phone. There was no question these guys eat breath and sleep Duramax.
It's like a brand new truck, only better. I love hot rodding, power braking, and generally abusing my truck. Also tow 10k lbs a few times a month. Temperatures are the same as when my stock tranny was still good, and i beleive I am getting better fuel mileage. But I havent been able to keep my foot out of the skinny peddle long enough to really find out. This transmission handles everything I have thrown at it. The shifts are solid and the triple disc TC tops it off. I can definitely feel the power hitting the ground now. I would highly recommend SDP to anyone looking for quality and expertise. I drove 4.5hrs to take my truck to them and I would have gone further if I had to. Especially after feeling it.

06 LBZ ccsb ~850-1000 HP trans build

Posted by brady seiler on 12th May 2016

After getting burned on a "built" transmission from an online forum, I gave Scott a call. Scott tore into it and reported that it was nearly the worst builds he has seen. Many of the clutches were installed backwards and several of the internal parts were destroyed. Scott worked his magic and the transmission now performs flawlessly. All of the shifts are smooth and quick and it has held up to everything I have thrown at it so far.
If anybody is having trouble deciding who to have build your transmission, look no further than SDP. Scott is very devoted to his job and he will make sure you are taken care of, no matter what your performance need is.

07.5 LMM ltz crew short.

Posted by Unknown on 1st Sep 2015

Scott is very knowledgeable and can help with any questions. The products are very high quality and my full trans build has been doing awesome! Very smooth shifts and holds the shifts firm.

2011 Sierra LML 2500HD

Posted by Unknown on 28th Aug 2015

Awesome Transmission! Has been flawless and the converter that Scott helped me choose is perfect! The converter is just loose enough were it starts to really bite were the power comes in.... These guys have another life long customer and would highly recommend them to anyone...

07 silverado lbz 2500hd crew long bed

Posted by Dillon on 17th Jul 2015

Would like to Thank all the guys at sdp that made my trans build happen in very short notice!.
Personally thank Scott for really taking care of me and great guy to work with! Wouldn't hesitate to recommend them to anyone.

Got my trans built and have like 2000 miles on it now. No issues at all. Tc locks up great and holds very well. Rather impressed compared to my old trans that slipped under load or on highway pulls.
Will definetly have future purchases with SDP!

06 silverado 2500HD cc 4x4 sb

Posted by nelson619 on 6th Jul 2015

Allison fully built transmission with billet torque converter courtesy of screamin diesel performance port angeles WA
Very good product and the service is superb Scott really took care professionally did the custom built hes got awesome team up there that can support your project duramax
My allison tranny feels reborn ready to take more power. Thanks SDP!

awesome trans build

Posted by Russ on 7th Apr 2015

Well I would personally like to thank Scott and his crew for their hospitality. Love be able to watch them work on my truck and BS them. Trans shifts great. So crisp and fast with no hesitation between gears. I will be coming back for future mods.

Excellent product done in 1 work day!

Posted by Austin Everett on 6th Mar 2015

Scott at SDP is a great guy to work with. Very personable and VERY knowledgeable on the latest and greatest Duramax/Allison performance products. I came to him, with no reservations, to upgrade my LB7 Allison trans with their full trans build kit. He did it on a Sunday of all days and from start to finish in under 8 hours. I have put around 700 miles on the trans now and it is awesome, to say the least. It shifts smooth and locks up great. Holds my 530whp with absolutely no problem at all. EXTREMELY pleased with the flexibility of Scott at SDP and the excellent workmanship he provides. I would recommend SDP for any of your Duramax performance needs.